Since s′ vo is greater than s′ vm, the clay is underconsolidated (OCR < 1) by an amount of 50 kPa at the center of the clay layer. The greatest underconsolidation is at the center of the clay layer, with the clay adjacent to the sand layers essentially normally consolidated. Hence assuming a linear distribution of underconsolidation increasing from zero at the top and bottom of the clay layer to a maximum value of 50 kPa, the average underconsolidation